基于多学科性能分析的驱动桥壳多目标优化

Multi-objective Optimization of Vehicle Drive Axle Housing Based on Multi-disciplinary Performance Analysis

在保证整车整体机械性能的前提下对底盘零部件进行优化,是当前汽车工程设计的一个重要挑战。针对汽车驱动桥壳的多学科多目标优化设计问题,提出了一种系统的设计方法。采用有限元数值模拟和试验验证相结合方法系统研究其动态模态频率及振型,静态刚、强度及垂直弯曲疲劳寿命多学科性能,在此基础上,以其结构参数为设计变量,以最大静应力和疲劳损伤系数为设计约束,以整体质量、最大静态变形量和动态一阶模态频率为优化目标,结合哈默斯雷试验设计、移动最小二乘代理模型及全局响应面多目标优化算法,对其进行多学科性能驱动的轻量化多目标优化设计。结果表明:优化设计前后驱动桥壳整体质量降低6.0%,取得了良好的轻量化设计效果。

Optimization for the chassis components under the condition of guaranteeing vehicle overall mechanical performance remains a key automotive engineering design challenge currently.The present study attempted to focus on the vehicle drive axle housing for multidisciplinary multi-objective optimization design and a systematic approach was proposed.The dynamic modal frequency and vibration model,static and strength,and vertical bending fatigue life of multi-disciplinary performance were systematically studied by using the method of finite element numerical simulation and experimental verification,on this basis,with its structure parameters as design variables,for the maximum static stress and fatigue damage coefficient design constraints,with its overall quality,the maximum static deformation and dynamic of first order modal frequency as the optimization goal,combined with HAMMERSLEY test design,moving least-square agent model and the global response surface multi-objective optimization algorithm.The lightweight multi-objective optimization design based on multi-disciplinary performance driving was carried out.The results show that the overall quality of the drive axle housing decreases by 6.0%before and after the optimized design,and good lightweight design effect is achieved.